【摘要】 塑料冲击试验机中摆锤形状影响空气阻力,进而影响摆锤长度计算结果的准确性。分析空气阻力计算的数学模型以及对摆锤侧板边缘截面分别为矩形、等腰梯形、三角形和椭圆形4种典型形状摆锤的空气阻力数值进行模拟,测定了摆锤的起始角与升角之间角度差,发现摆锤采用等腰梯形形状最合理,摆锤空气阻力随中部宽度、角度的减小而降低,但相对于中部宽度,角度对摆锤空气阻力影响更显著。更多还原

【Abstract】 The shape of pendulum in plastic impact testing machine affects air resistance,and then the accuracy of calculation results for pendulum length is affected.The mathematical model of air resistance is analyzed,and the numerical value about air resistance of four kinds of shapes of pendulum side plates such as rectangular,isosceles trapezoid,triangular,and elliptical are simulated.The angle difference between starting angle and lift angle of pendulum is tested.It is shown that the pendulum with isosceles trapezoid shape is the most reasonable.Air resistance of pendulum decreases with the reducing of middle-width and angle,meanwhile,cornpared with middle-width,the effect of angle is more significant on air resistance of pendulum.更多还原